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UV-LED/TiO<sub>2</sub> 고도산화공정을 이용한 천연유기물질 분해
오혜철 ( Hye-cheol Oh ),김석구 ( Seog-ku Kim ),이동석 ( Dong-seok Rhee ) 한국수처리학회(구 한국수처리기술연구회) 2017 한국수처리학회지 Vol.25 No.5
TiO<sub>2</sub> has been used as a clean and non-toxic photocatalyst for mineralization of natural organic matter, and also well known as an effective photocatalyst for treatment of various pollutants such as trihalomethanes (THMs), organic acids, heavy metals, pesticides, microorganism, and NOx etc. This study was evaluated to photocatalytic degradation of humic acid by UV-LED/TiO<sub>2</sub> system. In this research, the characteristics of photocatalytic degradation of humic acid, one of natural organic matter(NOM), by UV-LED/TiO<sub>2</sub> system were evaluated. To obtain the optimum operating conditions for the effective humic acid decomposition, rate of inflow (50-800 mL/min), TiO<sub>2</sub> concentrations (0-2000 mg/L) and initial pH (3-11) were varied in each experiments. Humic acid solution was collected every hour for analyzing pH changes, DOC removal rate and UV<sub>254</sub> reduction rate. The results of NOM decomposing characteristics evaluation in UV-LED/TiO<sub>2</sub> advanced oxidation process (AOP), rate of inflow 200 mL/min, TiO<sub>2</sub> concentration of 1,000 mg/L and initial pH of 7 showed the highest photocatalyst decomposition efficiency which considered to be applicable for water treatment. Further researches of finding the optimum operating conditions of UV-LED/TiO<sub>2</sub> advanced oxidation process in field application need to proceeded.
고순도 TiO2 나노결정에 의한 휴믹산의 광촉매 분해 특성
오혜철 ( Hye Cheol Oh ),이동석 ( Dong Seok Rhee ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.4
High purity TiO2 nanocrystals (rod shape, ≤ 100 nm) were synthesized from TTIP/H2O2/H2O systems, and utilized as photocatalysts for degradation of humic acid (HA) in the aqueous solution. The high purity TiO2 nanocrystals were obtained by excluding the use of inorganic acids that might consequently cause contamination of active catalytic surface sites of the nanocrystals by Cl-, NO3- and SO42-. Particle size and crystallinity of the nanocrystals were increased with progressing the refluxing time 1~9 h at 120℃ in an oil bath. By varying H2O2/Ti = 5.5~55, the crystalline phase of anatase/rutile ratio of the nanocrystals was controllable. The photocatalytic properties of the nanocrystals were strongly dependent upon the crystallinity and particle size. The dissolved organic carbon (DOC) removal of humic acid was most effective for the nanocrystals prepared at H2O2/Ti = 5.5 due to the mixed crystalline phase of anatase/rutile and the increased surface area by smaller particle size. The decreases of UV254 absorbance of HA solutions, which is caused by the conjugate double bond breakage, were much faster than those of DOC, and not so dependent upon the variations of TiO2 nanocrystals.
경작지와 축산 오염원 관리에 의한 팔당호의 영양염류 저감 효과 분석
오혜철 ( Hye-cheol Oh ),( Yoshihisa Shimizu ),김석구 ( Seog-ku Kim ),윤상린 ( Sang-leen Yun ),김영민 ( Young-min Kim ),이복진 ( Bok-jin Lee ),안재환 ( Jae-hwan Ahn ) 한국수처리학회 2016 한국수처리학회지 Vol.24 No.3
This study analyzed the effects of reducing nutrients by managing pollution sources from cultivated area and livestock area in order to improve the water quality of the Lake Paldang Basin. To predict the effects of reducing nutrients in the Lake Paldang Basin, water pollution sources were first analyzed and possible scenarios to reduce the sources were selected accordingly. Using the basin environmental database, water flow rates, and TN and TP concentrations were simulated based on the Soil and Water Assessment Tool (SWAT) model. Model evaluation indices were calculated through the calibration and validation of water flow rates, and TN and TP concentrations, and they were found that simulation values reflected measurement values well, and that it was possible to evaluate the Lake Paldang Basin both qualitatively and quantitatively. In the case of Scenario 3 in which a measure to reduce pollution sources from both cultivated area and livestock area was applied together, the concentrations of TN and TP were reduced by 29.6% and 28.6% respectively. It is believed to be important to improve water quality by managing pollution sources from both cultivated area and livestock area particularly in area like the Lake Paldang Basin where agricultural and livestock production activities are actively conducted. The results of analyzing the effects of reducing nutrients in the Lake Paldang Basin showed that the concentrations of TN and TP were reduced to 3.42 mg/L and 0.167 mg/L respectively in Scenario 3. It was found that measures to reduce pollution sources from cultivated area and livestock area were effective for improving the water quality of the Lake Paldang Basin. It is also believed that reducing the amount of fertilizer applied to cultivated area is effective for managing nutrients, and that it is necessary to expand environmental infrastructure to reduce pollution sources from livestock area.
팔당호 통합 호수 유역관리를 위한 유역환경 데이터베이스 구축
오혜철 ( Hye-cheol Oh ),안재환 ( Jae-hwan Ahn ),윤상린 ( Sang-leen Yun ),김영민 ( Young-min Kim ),박성균 ( Seung-kyun Park ),전기도 ( Ki-do Jeon ),김석구 ( Seog-ku Kim ) 한국수처리학회 2016 한국수처리학회지 Vol.24 No.3
This study established a basin environment database for Integrated Lake Basin Management in Lake Paldang. After collecting various data including digital elevation model (DEM), land use, soil, meteorological data and hydrological data, basin environment database was established through ArcGIS utilization. Lake Paldang Basin has a maximum altitude of 1,634 m, minimum altitude of 21 m, and average altitude of 471 m, and its area is 23,741 km2. Land use of Lake Paldang Basin consists of forest 77.7%, cropland 13.6%, pasture 3.7% and urban area 2.4%. Soil consists of loam 51.5% and sandy loam 48.5%. As a result of analyzing water pollution sources using the basin environment database, domestic, land and livestock pollution sources turned out to be the main causes. The total population at Lake Paldang Basin is 2,320,495, and the percentage of the sewered population is 67.7%. Since the non-sewered population takes up 32.3%, domestic pollution sources flowed in by Lake Paldang Basin can be reduced by supplying sewerage. The pollution loads emitted by agricultural lands are SS 40%, TN 52% and TP 50%, and the loads of livestock pollutant sources are SS 35%, TN 32% and TP 32%, taking up most of the pollution loads emitted from the entire basin. Therefore, Integrated Lake Basin Management to improve water quality of Lake Paldang were necessary to increase the percentage of sewered population and to reduce agricultural and livestock pollution sources.
이복진 ( Bokjin Lee ),오혜철 ( Hye-cheol Oh ),안재환 ( Jae-hwan Ahn ),김영민 ( Youngmin Kim ),강희준 ( Heejun Kang ),김석구 ( Seog-ku Kim ) 한국수처리학회(구 한국수처리기술연구회) 2018 한국수처리학회지 Vol.26 No.2
As an eco-friendly substitute to commercial coagulants, the Mineralized Coagulant was produced and its algae and nutrient control efficiencies were evaluated. The raw water of a reservoir (chlorophyll-a = 48.0 mg/㎥, total organic carbon = 95.3 mg/L) was treated with the mineralized coagulant and other commercial coagulants. After the coagulation, monthly analyses of chlorophyll-a, organic matters, and nutrient concentrations were performed twice. The mineralized coagulant showed 96% of chlorophyll-a and 94% of total organic matter removal efficiency while the range of all coagulants were 75% to 99% and 50% to 96%, respectively. For the nutrient, the mineralized coagulant showed the higher removal efficiency (83% for total nitrogen and 93% for total phosphorus) and the lower release from the coagulated algae than most of other coagulants.